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Debt
 3 Months Ended
Mar. 31, 2022
Debt Disclosure [Abstract]  
Debt Debt
Debt consists of the following:
March 31, 2022December 31, 2021
(in thousands)
$450 million senior unsecured notes due 2031 ("2020 Senior Notes") with an effective interest rate of 3.86%, less a discount and deferred issuance costs of $5.4 million and $5.5 million at March 31, 2022 and December 31, 2021, respectively
$444,622 $444,470 
$400 million senior unsecured notes due 2029 ("2019 Senior Notes") with an effective interest rate of 3.88%, less a discount and deferred issuance costs of $4.6 million and $4.8 million at March 31, 2022 and December 31, 2021, respectively
395,388 395,237 
$400 million senior unsecured notes due 2022 ("2012 Senior Notes") with an effective interest rate of 6.00%, less deferred issuance costs of $0.1 million and $0.2 million at March 31, 2022 and December 31, 2021, respectively (2)
216,486 216,351 
$600 million senior unsecured revolving credit facility (1)
— — 
Economic development loans with an effective interest rate of 3.00% at March 31, 2022 and December 31, 2021, respectively
4,416 4,416 
Total debt $1,060,912 $1,060,474 
Less current portion (2)
216,486 216,351 
Long-term debt$844,426 $844,123 
(1) During the third quarter of 2020, the Company utilized excess cash on hand to pay down its senior unsecured revolving credit facility balance in full and the facility remains undrawn as of March 31, 2022 and December 31, 2021. As there are no outstanding borrowings at March 31, 2022 or December 31, 2021, deferred issuance costs for the senior unsecured revolving credit facility of $2.1 million and $2.3 million, respectively, are presented in non-current Other assets in the consolidated balance sheets.
(2) The Company's 2012 Senior Notes mature on July 1, 2022 with a principal maturity, net of unamortized deferred issuance costs, of $216.5 million.
Refer to Note 12 and the Liquidity and Capital Resources header of "Management's Discussion and Analysis of Financial Condition and Results of Operations" for more information.